Laptop Voyager 5

I have one of these. Does anyone know how to find the spec. for the via chipset that drives the USB2 ports? I have fitted a D_LINK DUB-H4 hub and when I plug it in ALL units connected play up or cease working. I have to disable the USB generic hub driver to get any thing to work again. I think the problem is the via drivers and need to know their spec. to search for updates (if any!).

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